src/compiler/glsl/gl_nir_lower_images.c

   1 /*
   2  * Copyright © 2019 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file
  26  *
  27  * Lower image operations by turning the image_deref_* into a image_* on an
  28  * index number or bindless_image_* intrinsic on a load_deref of the previous
  29  * deref source. All applicable indicies are also set so that fetching the
  30  * variable in the backend wouldn't be needed anymore.
  31  */
  32
  33 #include "compiler/nir/nir.h"
  34 #include "compiler/nir/nir_builder.h"
  35 #include "compiler/nir/nir_deref.h"
  36
  37 #include "compiler/glsl/gl_nir.h"
  38
  39 static void
  40 type_size_align_1(const struct glsl_type *type, unsigned *size, unsigned *align)
  41 {
  42    unsigned s;
  43
  44    if (glsl_type_is_array(type))
  45       s = glsl_get_aoa_size(type);
  46    else
  47       s = 1;
  48
  49    *size = s;
  50    *align = s;
  51 }
  52
  53 static bool
  54 lower_impl(nir_builder *b, nir_instr *instr, bool bindless_only)
  55 {
  56    if (instr->type != nir_instr_type_intrinsic)
  57       return false;
  58
  59    nir_intrinsic_instr *intrinsic = nir_instr_as_intrinsic(instr);
  60
  61    nir_deref_instr *deref;
  62    nir_variable *var;
  63
  64    switch (intrinsic->intrinsic) {
  65    case nir_intrinsic_image_deref_atomic_add:
  66    case nir_intrinsic_image_deref_atomic_imin:
  67    case nir_intrinsic_image_deref_atomic_umin:
  68    case nir_intrinsic_image_deref_atomic_imax:
  69    case nir_intrinsic_image_deref_atomic_umax:
  70    case nir_intrinsic_image_deref_atomic_and:
  71    case nir_intrinsic_image_deref_atomic_or:
  72    case nir_intrinsic_image_deref_atomic_xor:
  73    case nir_intrinsic_image_deref_atomic_exchange:
  74    case nir_intrinsic_image_deref_atomic_comp_swap:
  75    case nir_intrinsic_image_deref_atomic_fadd:
  76    case nir_intrinsic_image_deref_atomic_inc_wrap:
  77    case nir_intrinsic_image_deref_atomic_dec_wrap:
  78    case nir_intrinsic_image_deref_load:
  79    case nir_intrinsic_image_deref_samples:
  80    case nir_intrinsic_image_deref_size:
  81    case nir_intrinsic_image_deref_store: {
  82       deref = nir_src_as_deref(intrinsic->src[0]);
  83       var = nir_deref_instr_get_variable(deref);
  84       break;
  85    }
  86    default:
  87       return false;
  88    }
  89
  90    bool bindless = deref->mode != nir_var_uniform || var->data.bindless;
  91    if (bindless_only && !bindless)
  92       return false;
  93
  94    b->cursor = nir_before_instr(instr);
  95
  96    nir_ssa_def *src;
  97    if (bindless) {
  98       src = nir_load_deref(b, deref);
  99    } else {
 100       src = nir_iadd_imm(b,
 101                          nir_build_deref_offset(b, deref, type_size_align_1),
 102                          var->data.driver_location);
 103    }
 104    nir_rewrite_image_intrinsic(intrinsic, src, bindless);
 105
 106    return true;
 107 }
 108
 109 bool
 110 gl_nir_lower_images(nir_shader *shader, bool bindless_only)
 111 {
 112    bool progress = false;
 113
 114    nir_foreach_function(function, shader) {
 115       if (function->impl) {
 116          nir_builder b;
 117          nir_builder_init(&b, function->impl);
 118
 119          bool impl_progress = false;
 120          nir_foreach_block(block, function->impl)
 121             nir_foreach_instr(instr, block)
 122                impl_progress |= lower_impl(&b, instr, bindless_only);
 123
 124          if (impl_progress) {
 125             nir_metadata_preserve(function->impl,
 126                                   nir_metadata_block_index |
 127                                   nir_metadata_dominance);
 128             progress = true;
 129          } else {
 130             nir_metadata_preserve(function->impl, nir_metadata_all);
 131          }
 132       }
 133    }
 134
 135    return progress;
 136 }